Patent US3534503A successfully refreshed from Google Patents.
US3534503A
Expired / Lapsed
US
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Abrading apparatus
Assignee: Pennwalt Corp
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Filing: 1967-08-21
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Granted: 1970-10-20
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Expires: 1987-08-21
Abstract
No abstract record available.
Inventors
- 👤 Walter Kulischenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:43
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/02; B24C3/06; B24C3/32; B24C3/322; H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB390476A
Cited
US2773332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |